You assume it was on the same engine as the 15whp gain, it was not.Originally Posted by Benefit
The header gained 15whp over a stock header, it also gained 15whp over a Tri-y on a built 1.8L LSVTEC
It would be foolish to try and "add those" numbers together and make a general statement.
What you can expect is a 10-15whp gain over stock, and if you have a built motor, it will beat the tri-y, its already been proven and not just by me
And yes , its entirely possible to see a 25whp gain from a header and TUNING, ive done it before. BUt as a general rule, 10-15whp is a crazy gain, and im confident most people will see that result. Other may be more lucky and see a bigger gain
